&#39; -(2(1h)pyridone)+65 -pivalyl-5-(&#39; -2,4-di-t-amyl-phenoxybutyramide)-acetanilides and derivatives

ABSTRACT

A substituted type photographic yellow coupler is characterized by having a substituent which is a 2(1H) -pyridone or 3(2H) pyridazone group, which may or may not have substituent groups thereon.

United States Patent 1191 Fujimatsu et a1.

[ Aug. 19, 1975 [54] 'y-[2(1H)PYRIDONE]y-PIVALYL-S-(y-ZAJH- T-AMYL-PHENOXYBUTYRAMIDE)- ACETANILIDES AND DERIVATIVES [75] Inventors: Wataru Fujimatsu; Shui Sato, both of Hachioji; Tamotsu Kojima, Kokubunji; Takaya Endo, Hino; Kazumi Minahara, Hachioji, all of Japan [73] Assignee: Konishiroku Photo Industry Co.,

Ltd., Tokyo, Japan 22] Filed: Apr. 13, 1973 [21] Appl. No.: 351,031

[30] Foreign Application Priority Data Apr. 15, 1972 Japan 47-37367 May 27, 1972 Japan 47-52179 [52] US. Cl 260/294.9; 260/250 A; 260/287 R; 260/295 AM; 96/100 ;5 Kmsuaq [51] Int. Cl. C07D 31/44; C07D 31/46 [58] Field of Search 260/295 AM, 294.9

[56] References Cited UNITED STATES PATENTS 11/1970 Mrozik 260/295 AM 7/1972 Carabateas 1. 260/295 AM Primary Examiner-A1an L. Rotman Attorney, Agent, or Firm-Waters, Schwartz & Nissen [5 7] ABSTRACT A substituted type photographic yellow coupler is characterized by having a substituent which is a 2( 1H) -pyridone or 3(2H) -pyridazone group, which may or may not have substituent groups thereon.

1 Claim, 2 Drawing Figures r Exposure(LogE) PATENTEU AUG 1 91975 mo mcjwoaxw Fli DensLty g3:

PATENTEDAUB 1 91975 Exposure (Log E) DensLty y-[ 2( 11H )PYRIDONE17-PIVALYL-5 'y-2 ,4-DI-T- AMYL-PHENOXYBUTYRAMIDE )-ACETANILIDES AND DERIVATIVES This invention relates to a novel coupler for forming a yellow image which is used in color photography.

It is well known that in color photography, a couplercontaining light-sensitive photographic material, for example, is exposed and then color-developed with a developer containing an aromatic primary amine type developing agent as a main ingredient to form a dye image. Among the couplers used in said photography, the yellow coupler has an active methylene group which serves to form a yellow dye by coupling with an oxidation product of the aromatic primary amine type developing agent. ln case the said active methylene group has not been substituted, i.e. in the case of an unsubstituted type yellow coupler, 4 molecules of silver halide is required in order to form one molecule of dye in the color development. For this reason, the abovementioned yellow coupler is called a 4-equivalent yellow coupler.

On the other hand, it is well known that the same dye as in the case of the unsubstituted type coupler can be formed also from a socalled substituted type yellow coupler, i.e. a yellow coupler having an active methylene group, one of the hydrogen atoms of which has been substituted by a substituent such as a chlorine atom or the like halogen atom. In this case, the halogen atom or the like substituent is released in the course of the color development reaction, and one molecule of dye can be formed from 2 molecules of developed silver halide. For this reason, such substituted type yellow coupler as mentioned above is called a 2-equivalent yellow coupler.

This 2-equivalent yellow coupler has advantages over the 4-equivalent coupler such as mentioned below.

I. The Z-equivalent yellow coupler is higher in coupling rate than the 4-equivalent yellow coupler, and hence is successfully usable in high temperature quick processing, particularly in 3-bath processing comprising only the steps of development, bleaching, fixing and waterwashing.

2. The amount of silver halide required for forming a dye may be one half the amount required in the case of the 4-equivalent coupler, so that the productioncost of the photographic material can be reduced. A

3. The emulsion layer can be made thinner to improve the resulting color image in resolution andsharpness. 4. In the case of a multi-layered photographic material, the transmission of light to the lower layers is enhanced to improve the photographic material in photographic speed.

ln view of the above-mentioned advantages, the substituted type yellow coupler is extremely advantageous for use in photography. On the other hand, the conventional substituted type yellow coupler has the disadvantages that it tends to form fog or the like color stains and tends to disturb the development of photographic material.

In contrast to the conventional substituted type yellow coupler mentioned above, the substituted type yellow coupler according to the present invention is colorless, is high in reactivity and scarcely forms color stains. Moreover, the yellow dye formed by the aforesaid color development is excellent in fastness to light, humidity, heat and pressure, has no unnecessary absorptions in the long wavelength area, shows less and sharp absorptions in the green light area, and has a color tone quite favorable for color reproduction.

The substituted type photographic yellowcoupler according to the present invention is represented by'the formula,

x (R) IT N/fijf n wherein X is a -N= or CH= group; C is a residue formed by removing one hydrogen atom of the active methylene group of a yellow coupler having an active methylene group; n is an integer of 1 to 4; and R is a hydrogen or halogen atom, or an alkyl, alkoxy, alkylcarbonyl, aryl, arylcarbonyl, amino, acylamino, carboxyl, nitrile, aralkyl or aralkyloxy group, provided that in case n is 2 or more, the Rs may be the same or different, and two adjacent Rs in combination may form a benzene ring. The coupler according to the present invention is characterized by having as a substituent in the active point thereof 2( lH)-pyridone or 3(2H)-pyridazone having or not having substituted groups. Typical examples of the said substituents are as follows:

- 2( ll-l)-Pyridone 3-Chloro-2( 1H)pyridone 5-Bromo-2( 1H )-pyridone 3-Fluoro-2( lH)-pyridone 3,5-Dichloro-2( 1H )-pyridone 5 Acetamide-2( 1H )-pyridone 5-Chloro-2( lH)-pyridone 3 ,5-Dibromo-2( 1H )-pyridone 5-Benzoyl-2( lH)-pyridone 5-Acetyl- 2( lll-l)pyridone 5-Benzoyl-3-bromo-2( lH)-pyridone 5-p-Ethylbenzoyl-2( 1H )-pyridone '3-Bromo-4-ethoxy-2( lH)-pyr'idone 5-p-.Chlorobenzoyl-2( lH)-pyridone 3-Ethyl-2( lH).-pyridone 4-Methoxy-2( 1H )-pyridone 3-Methyl2( lH)-pyridone 3,5-Dimethyl-2( lH)-pyridone 5-Bromo-3-methyl-2( lH)-pyridone 4-Acetyl-2( 1H )-pyridone 5-Ethyl-4-methyl-2( lH)-pyridone 3,4,5,6-Tetrachloro-2( 1H )-pyridone 4-Butoxy-2( lH)-quinolone 3-Methyl-2( 1H )-quinolone 4-Methyl-6-phenyl-2( 1H)-quinolone 3,4-Dimethyl-2( lH)-quinolone 4-Phenyl-2( lH)-quinolone 3-Phenyl-2( 1H)-quinolone 3-l-lexyl-2( 1H)-quinolone 4 -Carboxylic acid-2( lH)-quinolone 4-Benzyloxycarbonyl-2( lH)-quinolone 3 2H )-Pyridazone 4,5Dibromo-3(2H)-pyridazone 4,5-Dichloro-3 2H )-pyridazone 6-p-Bromoanilino-3 2H )-pyridazone 4-Methyl-3( 2H )-pyridazone 4-Methyl-5-ethyl-3 2H )-pyridazone 4,6-Dimethyl-3(2H )-pyridazone 6-Phenyl-3( 2H )-pyridazone di-t-amylphenoxy )-butyramide -acetanilide acctanilide (B- 14) a-[4-Methyl-6-chloro-3 2H )-pyridazone]-oz-pivalyl-2- chloro--[ y'( 2,4-di-t-amylphenoxy)-butyramide acetanilide 5 Cl f CH 4 3-00 (3H CONH CH N o N f Cl CH C H (t) N'HCO(CH O C H (t) (8-15) a-[ 6-Octyl-3( 2H )-pyrid azone -a-pivalylacetanilide E 3 CH; (I) COCfI-ICONH-Q H NJEf a- 6-Phenyl-3 2H )-pyridazone]-a-{ 3-[a-( 2,4-di-tamylphenoxy)-butyramide]-benzoyl}-2- methoxyacetanilide N 0 Bl NHCOCIIHO 0 H: (t)

a-[4-Chlor0-5-amino-3( 2H )-pyridazone ]-abenzoylacetanilide (B- l 8) a-[4-Acetyl-5 ,6diphenyl-3(2H)-pyridazone]-acbenzoylacetanilide OOCHCONH @1 Q ,N o N COCH U 3 (B- l 9 a[4,5-Dichloro-3(2H)-pyridazone]-a-benzoyl-2- ch1oro5- oz-( dodecyloxycarbonyl -ethoxycarbonyl acetanilide COCHCONH Q, Q

N/N o COOCHCOOC SYNTHESIS EXAMPLE 1 Synthesis of the coupler (A-l A mixture comprising 3.0 g. of a-pivalyl-abromoacetanilide and 1.4 g. of 2( lH)-pyridone potassium salt was reacted by heating under reflux for 2 hours in 50 ml. of acetonitrile. Thereafter, the reaction liquid was subjected to filtration, and the filtrate was dried under reduced pressure. Subsequently, the residue was recrystallized from alcohol to obtain 2.l g. of white crystals, m.p. 22923lC.

Elementary analysis:

Calculated ('7!) 69.21 6.45 897 ound ("/1) 916 6.43 9.01

SYNTHESIS EXAMPLE 2 Synthesis of the coupler (A-l()):

A mixture comprising 2.6 g. of a-benzoyl-achloroacetanilidc and 2.1 g. of 3-br0mo-2(1H)- pyridone, and 50 ml. of acetonitrile were treated in the same manner as in Synthesis Example 1 to obtain 2.3 g. of white crystals, mp. 141-143C.

Elementary analysis:

Synthesis of the coupler (A-17):

A mixture comprising 6.1 g. of a-pivalyl-a-chloro-Z- chloro--['y-(2,4-di-tamylphenoxy)-butyramide1- acetanilide and 2.1 g. of 5-bromo-2(1H)-pyridone potassium salt was reacted for 3.5 hours in 70 ml. of acel5 tonitrile. After the reaction, the reaction liquid was subjected to filtration, and the filtrate was dried under reduced pressure. Thereafter, the residue was dissolved in 100 ml. of ethyl acetate, washed with a 5% aqueous sodium carbonate solution, washed with water and then treated with a lN-aqueous hydrochloric acid solution. Subsequently, the ethyl acetate layer was concentrated, and the residue was recrystallized from a mixed solvent comprising n-hexane, alcohol and water to obtain 5.] g. of white crystals, m.p. 158.5-160.5C.

Elementary analysis:

C H N Br Cl Calculated 61.41 6.65 5.65 10.75 4.77 Found 61.39 6.66 5.71 10.43 4.84

SYNTHESIS EXAMPLE 4 c H N cl Calculated ("/1) 68.70 7.95 6.33 5.34 Found /l 68.79 7.61 6.27 5.41

According to the above-mentioned synthesis procedures, other couplers bearing numbers prefixed with A can be synthesized as well. Elementary analysis values of the thus synthesized couplers are as set forth in the following table:

Elementary analysis values SYNTHESIS EXAMPLE 5 Synthesis of the coupler (B-l A mixture comprising 5.2 g. of a-pivalyl-achloroacetanilide and 2.9 g. of 3(2H)-pyridazone potassium salt was reacted by heating under reflux for 2 hours in ml. of acetonitrile. After the reaction, the reaction liquid was subjected to filtration, and the filtrate was dried under reduced pressure. Thereafter, the residue was recrystallized from methyl alcohol to obtain white crystals, m.p. 212214C.

Elementary analysis:

C H N Calculated 65.16 6.11 13.41 Found 65.24 6.07 13.29

SYNTHESIS EXAMPLE 6 C H N C1 Calculated 62.05 3.84 1 1.43 9.64 Found 62.01 3.87 11.40 9.71

SYNTHESIS EXAMPLE 7 Synthesis of the coupler (B-5):

A mixture comprising 4.3 g. of y-pivalyl-y-chloro-2- chloro-5-[ y-( 2,4-di-t-amylphenoxy )-butyramide acetanilide and 1.5 g. of 4,5-dich1oro-3(2H)- pyridazone was reacted by heating under reflux for 2 hours and 45 minutes in 80 ml. of acetonitrile. After the reaction, the reaction liquid was subjected to filtration, and the filtrate was dried under reduced pressure. Subsequently, the residue was dissolved in ml. of ethyl acetate, washed with a 5% aqueous sodium carbonate solution, washed with water, treated with a 1N- aqueous hydrochloric acid solution, and then washed with water. Thereafter, the ethyl acetate layer was concentrated, and the residue was recrystallized from a mixed solvent comprising n-hexane and ethyl alcohol to obtain white crystals, m.p. 183-l85C.

Coupler Calculated Found No. C N Cl Br C H N Cl Br (A- 2) 56.70 4.76 7.35 18.60 56.64 4.77 7.31 18.54 (A- 4) 65.32 7.07 6.01 10.15 65.29 7.11 5.99 10.11 (A- 5) 65.49 4.12 7.63 9.67 65.43 4.12 7.57 9.71 (A- 6) 72.43 7.27 6.18 72.37 7.26 6.14 (A- 7) 56.86 5.96 3.32 9.46 56.91 5.94 3.27 9.53 (A 8) 58.79 5.66 5.02 I 19.08 58.80 5.66 4.99 19.17 (A 9) 67.95 7.17 8.13 5.14 67.89 7.14 8.07 5.07 (A-11) 61.41 6.65 5.65 4.77 10.75 61.50 6.59 5.59 4.69 10.68 (A-12) 50.90 4.04 6.60 8.35 18.82 50.82 4.02 6.57 8.42 18.73 (A-13) 64.90 6.38 5.54 10.53 64.93 6.38 5.61 10.41 (A-14) 70.56 7.11 8.23 70.61 7.09 8.17 (A-15) 72.95 6.35 6.30 73.00 6.33 6.27 (A-16) 65.77 6.33 5.61 9.47 65.82 6.34 5.59 9.43 (A-lX) 73.31 5.59 7.77 73.33 5.60 7.81 (A-19) 69.91 6.80 8.58 69.99 6.82 8.61 (A 20) 68.10 6.91 5.54 4.68 68.16 6.89 5.51 4.72

l 16 Elementary analysis: The thus obtained yellow couplers according to the present invention are useful as the so-called protect dispersed type couplers used in the form of solutions in C H N C] h1 hboilm or amc so1vents,e. .dibut 1 htha1ate,tr1-

g g g g y Calculated 60.53 6.45 7.63 14.49 5 cresyl phosphate, etc., which have a boiling point of Found 60-57 14-41 more than 175C. and which are difficultly miscible with water. Alternatively, they may be used in the form of solutions not in the abovementioned high boiling sol- SYNTHESIS EXAMPLE 8 vents but only in substantially water-insoluble low boils mh i f h Coupler 3-4); 10 ing organic solvents such as ethyl acetate, butyl ace- A mixture comprising of a benzoyl a chloro 2 tate, etc., Or in water-soluble lOW organic solhl0r 5 ['y (dodecyloxycarbonyl) eth ycarb0nyl] vents such as methanol, ethanol, iSObUtyl keacetanilide and 4.0 g. of 4,5-dibromo-3(2l-l)- tone, etc. Some of the couplers are quite useful as the pyridazone was reacted by heating under reflux for 3 so-cahed Fischehs dispersed yp couplers which are hours in 100 ml. of acetonitrile. Thereafter, the reacdlspersed y use of alkahhe or aqueous Soluhonstion liquid was treated in the same manner as in Synthe- Further, the yellow Couplers accordmg to the Present sis Example 7, and the resulting residue was recryst 1 invention are useful as the so-called external couplers lized from a mixed solvent comprising n-hexane and of such a WP that the Couplers are incorporated into ethyl alcohol to obtain white crystals, m.p. 1101 1 1C. developers to form y Images, or as couplers for use Elementary analysis: in the so-called diffusion transfer method, in which a photosensitive layer and an image-receiving sheet are brought into contact with each other during develop- C H N ment to carry out image transfer. Calculated 5190 519 438 1973 Thus, the yellow couplers according to the present Found 51.89 4.98 5.21 4.42 19.80 invention may be used to form yellow dye images by adoption of various methods. Further, they have such advantages that even when any method is adopted, the SYNTHESIS EXAMPLE 9 resulting dyes are excellent in spectral absorption charsynthesis of the coupler (B9): acteristics and are quite stable to light, heat and humid- A mixture comprising g. of a pivalyl a chloro z ity. in case the yellow couplers according to the present Chlom 5 [,y (2,4 di t amylphenoxy) butyramide] invention are incorporated into light-sensitive color acetanilide and of 45 dibr0mO 3(2H) photographic materials, the photosensitive layers can pyridazone potassium salt was treated in the same manbe h thlhher whh h result that the photogmph1C ner as in Synthesis Example 7, and the resulting residue mammals h e? 1h sharpness and h h m was recrystallized from a mixed solvent comprising h addmoh the photoghaphlc matehals ethyl alcohol and benzene to obtain white crystals, m.p. lhcorporated Whh the couplers accorhhg to the pres' 185648800 ent invention have the advantages that even when the Elementary analysis: development time is prolonged, they are scarcely increased in fo and form no such color stains as ob- 40 g served in the case where conventional couplers are C H N Br Cl used.

l I Calculated 53.99 5.76 6.81 19.42 4.31 AS CO 9 developlng agents which are used In comp Found 54.03 5.74 6,79 1935 427 nation w1th the couplers according to the present invention, there may be used p-aminophenol type developing agents whose amino groups have not been substi- According to the above-mentioned synthesis procetuted, or phenylenediamine type silver halide developdures, other cou lers bearin numbers refixed with ing agents such as, for exam 1e, dieth l P g P P y P B can be synthesized as well. Elementary analysls phenylenediamine hydrochloride, monomethyl-pvalues of the thus synthesized couplers are set forth in phenylenediamine hydrochloride, dimethyl-pthe following table: phenylenediamine hydrochloride, 2-amino-5- Elementary analysis values Coupler Calculated Found No. C H N Cl Br C H N Cl Br (B 2) 68.46 4.54 12.61 68.51 4.55 12.58 (B- 3) 66.80 7.42 8.42 5.33 66.73 7.41 8.39 5.24 (B4 6) 43.33 3.64 8.92 33.92 43.37 3.64 8.91 33.87 (B- 7) 57.15 4.80 11.59 16.53 57.11 4.82 11.63 16.61 (B-10) 50.70 5.13 4.55 17.30 50.76 5.11 4.59 17.37 (B1 1) 61.00 5.62 5.21 4.39 9.90 61.05 5.61 5.17 4.45 9.89 (B-l2) 56.45 3.74 10.39 17.54 56.51 3.76 10.43 17.47 (8-13) 63.85 6.49 11.76 63.91 6.51 11.73 (8-14) 63.94 7.06 7.85 9.94 64.00 7.06 7.89 9.99 (8-15) 7056 8.29 9.87 70.50 8.31 9.89 (8-16) 72.99 6.93 7.40 73.03 6.93 7.37 (B-17) 59.61 3.95 14.64 9.26 59.67 3.93 14.61 9.20 (B48) 75.13 4.78 7.97 75.07 4.80 7.91 (B-l9) 58.30 5.59 5.83 14.75 58.37 5.62 5.81 14.69

17 diethylaminotoluene hydrochloride, 2-amino-5-(N- ethyl-N-dodecylamino )-toluene, N-ethyl-N-B- methanesulfonamidoethyl-3-methyl-4-aminoaniline sulfate, N-ethyl-N-,B-methanesulfonamidoethyl-4- aminoaniline and 4-N-ethyl-N-B- hydroxyethylaminoaniline. Some of the couplers according to the present invention are incorporated into alkaline developers and are used as external couplers, as mentioned previously. Even when the developers used in the above case contain sulfites, carbonates, bisulfites, bromides or iodides of alkali metals, the yellow couplers according to the present invention bring about no detrimental interactions with the compounds contained in the developers.

A typical example of the above-mentioned developers is as follows:

2-Aminrr5-diethylaminotoluene hydrochloride 2.0 g. Anhydrous sodium sulfitc 2.0 g. Anhydrous sodium carbonate 2.0 g. Potassium bromide L g. Yellow coupler (A-l or (B-6) 2.0 g. Water to make 1,000 ml.

The yellow couplers according to the present invention are applicable to various light-sensitive color photographic materials susceptible to, for example, ultraviolet rays, visible rays, infrared rays, X-rays, 'y-rays, or microwave and the like electromagnetic wave energies. For incorporation of the couplers according to the present invention into light-sensitive color photographic emulsions, there may be adopted any of the known procedures. For example, in order to be used as the previously mentioned protect type coupler, one or more of the couplers according to the present invention are dissolved in one or both of at least one high boiling organic solvent having a boiling point of more than 175C. such as tricresyl phosphate or dibutyl phthalate and at least one low boiling organic solvent such as ethyl acetate or butyl propionate. Subsequently, the resulting solution is mixed with an aqueous gelatin solution containing a surface active agent, and then dispersed by means of a high speed rotary mixer or colloid mill to form a coupler dispersion. The thus formed coupler dispersion is added directly to a silver halide photographic emulsion, which is then coated on a support, followed by drying. Alternatively, the above-mentioned coupler dispersion is set, finely cut, freed from the low boiling solvent by water-washing or the like means, and thereafter added to the photographic emulsion, which is then coated on a support, followed by drying. In this case, it is preferable, in general, to incorporate the coupler according to the present invention in a proportion of to 300 g. per mole of the silver halide, though the proportion may be varied depending on application purposes.

Among the couplers according to the present invention, the couplers (A-4), (A-8), (8-4), (8-5) and (8-16), for example, may be dispersed in photographic emulsions by adoption of the above-mentioned procedure without using high boiling solvents; the couplers (A-7) and (B10) may be dispersed in an emulsion according to the Fischers dispersion method; the couplers (A-l (B-6) and (B-8) may be incorporated into developers; and the coupler (8-15) may be used for diffusion transfer.

The photographic emulsions, which are used in the present invention to form yellow images by use of the yellow couplers according to the present invention, may be prepared by use of various silver halides such as silver chloride, silver iodobromide, silver chlorobromide, etc. Further, the emulsions may have been subjected to chemical sensitization or to spectral sensitization using carbocyanine dyes or merocyanine dyes, and may have been incorporated with ordinary photographic additives such as, for example, anti-foggants, stabilizers, stain-preventing agents, anti-irradiation agents, high polymer additives, coating aids, etc.

Light-sensitive color photographic materials containing the couplers according to the present invention are incorporated with ultraviolet absorbers, whereby the resulting color images can be further enhanced in durability. Color developers used to develop light-sensitive color photographic materials containing the yellow couplers according to the present invention, or color developers containing the yellow couplers according to the present invention, may contain development controlling agents, eg citrazinic acid, in addition to the aforesaid developing agents.

The present invention is illustrated in more detail below with reference to examples, but it is needless to say that the scope of the invention is not limited to the examples.

EXAMPLE 1 20.0 Grams of each of the couplers (A-3), (A-l7), (8-9), (8-16) and (8-19) was completely dissolved at 60C. in a mixed solvent comprising 20 ml. of dibutyl phthalate and 60 ml. of ethyl acetate. The resulting solution was mixed with 10 ml. of a 6 percent aqueous solution of Alkanol B (a]kylnaphthalenesulfonate produced by DuPont) and with 200 ml. of a 6 percent aqueous gelatin solution, and the mixture was dispersed by means of a colloid mill to form a coupler dispersion. This coupler dispersion was added to 1 kg. of a high sensitivity silver iodobromide emulsion, which was then coated on a film base and dried to obtain a lightsensitive photographic material having a stable film coating. The thus obtained photographic material was exposed according to an ordinary procedure and then developed at 20C. for 10 minutes with a developer of the following composition:

N-Ethyl-NB-methanesulfonamidoethyl- 3methyl-4-aminoa.niline hydrochloride Anhydrous sodium sulfite Benzyl alcohol Sodium carbonate (monohydratc) Potassium bromide Sodium hydroxide Water to make (11 -OWNLII U1 1 LIIOOOOOO mm r e Table 1 Yellow image Sample Ratio of residual dye No. Coupler X-max D-max Light Humidity fastness fastness l Unsubstituted type coupler identical in structure 448 1.21 97 99 with the coupler (A-3) 2 Coupler (A-3) 448 1.99 97 99 3 Unsubstituted type coupler identical in structure 448 1.22 97 99 with the coupler (A-l7) 4 Coupler (A-l7) 448 2.10 98 99 5 Unsubstituted type coupler identical in structure 447 1.52 96 99 with the coupler (B9) 6 Coupler (B-9) 447 1.91 96 100 7 Unsubstituted type coupler identical in structure 453 1.86 74 96 with the coupler (8-16) 8 Coupler (8-16) 453 2.43 75 98 9 Unsubstituted type coupler identical in structure 453 1.86 74 96 with the coupler (B-l9) l Coupler (8-19) 453 2.73 74 99 A-max: Spectral absorption maximum wavelength D-max: Maximum density Ratio of residual dye: Ratio of dye left after subjecting a portion having an initial density of 1.0 to the following treatments:

Treatments:

Light fastness: Exposed to xenon arc lamp at 50C.

for 30 hours.

Humidity fastness: Allowed to stand at 50C. and

RH 80 percent for 7 days.

From Table 1, it is understood that the yellow couplers according to the present invention provide excellent properties and are quite useful as photographic yellow couplers for use in multi-layered polychromatic photographic materials.

EXAMPLE 2 Each of the couplers (A-ll), (13-4) and (8-5) was added in the same manner as in Example 1 to a gelatin silver iodobromide emulsion. The amount of silver halide used in this case was identical with that in Example 1. Subsequently, the emulsion was treated in the same manner as in Example 1 to prepare photographic materials.

For comparison, photographic materials were prepared in the same manner as above, except that the couplers used were unsubstituted type couplers identical in structure with the above-mentioned couplers.

The thus prepared photographic materials were exposed and then developed with the same developer as in Example 1 to obtain samples. These samples were individually measured by means of a densitometer in density of yellow dye to blue light at each stage. The results obtained were plotted to obtain the graph as shown in the accompanying drawings, in which the horizontal axis shows the exposure amount (log E) and the vertical axis shows the density. In FIG. 1, the curve 1 shows the case where the 4-equivalent coupler was used; the curve 2 shows the case where the coupler (A-l l according to the present invention was used; in H0. 2 the curves 3 and 4 show, respectively, the cases where an unsubstituted type coupler identical in structure with the coupler (B-4) and an unsubstituted type coupler identical in structure with the coupler (8-5) were used; and the curves and 6 show, respectively, the cases where the couplers (B-4) and (B-5) accord ing to the present invention were used.

As is clear from the drawing, the couplers according to the present invention can be successfully used even when silver is used in one half the amount required in the prior art.

EXAMPLE 3 Each of the couplers (A-7) and (8-10) was dispersed in a mixed solvent comprising ethanol and water, and then dissolved by addition of a 10 percent aqueous sodium hydroxide solution. The resulting solution was mixed with a gelatin solution containing 12 percent of gelatin and 5.13 percent of Alkanol B, and then neutralized with acetic acid. The neutralized liquid was dispersed in a silver iodobromide emulsion, which was then coated on a support and dried to obtain a photographic material. This photographic material was subjected to ordinary exposure, developed at 20C. for 10 minutes with the same developer as in Example 1, and then subjected to 3-step bath treatments comprising bleach-fixing, water-washing and stabilization to prepare samples.

For comparison, control samples were prepared in the same manner as above, except that the couplers used were identical in structure with the couplers (A-7) and (B-l0).

These samples were individually measured in fog, A-max and D max to obtain the results as set forth in Table 2.

As is clear from Table 2, it is understood that even when the Fischers dispersion method is adopted, the yellow couplers according to the present invention provide excellent photographic properties.

EXAMPLE 4 Photographic materials containing an ordinary silver iodobromide emulsion were individually exposed and then subjected to color development using a color developer of the composition shown below which contained each of the couplers (A- l (B-6) and (B-8) and unsubstituted type couplers identical in structure with said couplers.

Composition of developer:

2-AminoS-diethylaminotoluene hydrochloride Anhydrous sodium sulfite Anhydrous sodium carbonate Pottasium bromide Coupler Water to make Each sample obtained in the above manner was measured in fog, A-max and D-max to obtain the results as set forth in Table 3.

Table 3 coupler identical in structure with the coupler (B-8) From Table 3, it is understood that the couplers ac cording to the present invention are quite useful as external couplers, as well.

EXAMPLE A silver iodobromide emulsion incorporated with the coupler (B-) was coated on a paper and then dried to prepare a photographic material. This photographic material was subjected to image-wise exposure, developed with an alkaline developer (pl-l 13) containing, per liter, 2 g. of sodium sulfite and l l g. of 4-N-ethyl-N- ,B-hydroxyethylaminoaniline, and then closely contactcd at 24C. for 3 minutes with an image-receiving sheet containing dimethyl-B-hydroxyethyl-ystearamidopropyl ammonium dihydrogen phosphate as a mordanting agent. Subsequently, the image-receiving sheet was peeled off from the photographic material to obtain an excellent positive image of yellow dye derived from diffusion transfer onto the image-receiving sheet of a yellow dye, which had been formed due to the aforesaid development.

What we claim is:

1. A compound selected from the group consisting a-[2 lH)-Pyridone]-a-pivalyl 2-chloro-5( 'y-2,4-dit-amylphenoxybutyramide)-acetanilide;

a-[5-Chloro-2( lH)-pyridone]- a-pivalyl-Z-chloro-S- ['y-(2,4-di-t-amylphenoxy)butyramide1- acetanilide;

a-[2( lH)-Pyrid0ne]-oz- 3[a-(2,4-di-tamylphenoxy)bu'tyramidel-benzoyl -2- methoxyacetanilide;

a-[3,5-Dibromo-2( lH)-pyridone]-0z- 3-[a-(2,4-di-tamylphenoxy)-butyramide]-benzoyl -2- methoxyacetanilide;

a-[3-Nitrile-2( 1H)-pyridone]-a-pivalyl-2-chloro-5- ['y-( 2,4-di-t-amylphenoxy)-butyramide acetanilide;

a[ 3-Bromo-2( lH)-pyridone]a-pivalyl2chloro-5- [y-(2,4-di-t-amylphenoxy)-butyramide] acetanilide;

a-[5-Bromo-2( lH)-pyridone]-oz- 3-[a-(2,4-di-tamylphenoxy)-butyramide]-benzoyl -2- methoxyacetanilide;

a-[3,5-Dichloro-2( lH)-pyridone]-a- 3-[a-(2,4-di-tamylphenoxy)-butyramide]-benzoyl -2- methoxyacetanilide; and

a-[ 5-Bromo-2( 1H )-pyridone ]a-pivalyl-2-chloro-5- ['y-(2,4-dit-amylphenoxy)-butyramide]- acetanilide. 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF: A(2 N1H)-PYRIDONE)-A-PIVALY-2-CHLORO-5-( Y-2,4-DI-TAMYLPHENOXYBUTYRAMIDE)-ACETANILIDE, A-(5-CHLORO-2(1H)-PYRIDONE)- A-PIVALYL-2-CHLORO-5-(Y(2,4-DI-T-AMYLPHENOXY)BUTYRAMIDE)-ACETANILID, A-(2(1H)-PYRIDONE)-A- 3-(A-(2,4-DI-T-AMYLPHENOXY)BUTYRAMIDE)-BENZOYL -2-METHOXYACETANILIDE, A-(3,K-DIBROMO-2(1H)-PYRIDONE)-A- 3-(A-(2,4-DI-T-AMYLPHENOXY)-BUTYRAMIDE)-BENZOYL -2-METHOXYACETANILIDE, 11 A-(3-NITRILE-2(1H)-PYRIDONE)-A-PIVALYL-2-CHOLORO-5-(Y(2,4DI-T-AMYLPHENOXY) -BUTYRAMIDE)-ACETANILIDE, A-(3-BROMO-2(2H)-PYRIDONE)-A-PIVALYL-2-CHLORO-5-NY-NI,4DI-T-AMYLPHENOXY) -BUTYRAMIDE)-ACETANILIDE, A-NK-BROMO-2(1H)-PYRIDONE)-A- 3-(A-NI,4-DI-T-AMYLPHENOXY)-BUYRAMIDEE-BENZOYL -2-METHOXYACETANILIDE, A-(3,5-DICHLORO-2(1H)-PYRIDONE)-A- 3-(A-(2,4-DI-T-AMYLPHENOXY)-BUTYRAMIDE)-BENZOYL -I-METHOXYACETANILIDE, AND A-(5-BROMO-2(1H)-PYRIDONE)-A-PIVALYL-2-CHLORO-5-NY-(2,4DI-AMYLPHENOXY) -BUTYRAMIDE)-ACETANILIDE. 